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CY7C1618KV18 Datenblatt(PDF) 7 Page - Cypress Semiconductor

Teilenummer CY7C1618KV18
Bauteilbeschribung  144-Mbit DDR II SRAM Two-Word Burst Architecture
Download  32 Pages
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Hersteller  CYPRESS [Cypress Semiconductor]
Direct Link  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

CY7C1618KV18 Datenblatt(HTML) 7 Page - Cypress Semiconductor

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Document Number: 001-44274 Rev. *N
Page 7 of 32
CY7C1618KV18/CY7C1620KV18
page 6. The bytes that are written are determined by BWS0 and
BWS1, which are sampled with each set of 18-bit data words.
Asserting the appropriate Byte Write Select input during the data
portion of a write latches the data being presented, and writes it
into the device. Deasserting the Byte Write Select input during
the data portion of a write enables the data stored in the device
for that byte to remain unaltered. This feature can be used to
simplify read, modify, or write operations to a byte write
operation.
Single Clock Mode
The CY7C1618KV18 can be used with a single clock that
controls both the input and output registers. In this mode, the
device recognizes only a single pair of input clocks (K and K) that
control both the input and output registers. This operation is
identical to the operation if the device had zero skew between
the K/K and C/C clocks. All timing parameters remain the same
in this mode. To use this mode of operation, the user must tie C
and C high at power on. This function is a strap option and not
alterable during device operation.
DDR Operation
The CY7C1618KV18 enables high performance operation
through high clock frequencies (achieved through pipelining) and
DDR mode of operation. The CY7C1618KV18 requires a single
No Operation (NOP) cycle during transition from a read to a write
cycle. At higher frequencies, some applications may require a
second NOP cycle to avoid contention.
If a read occurs after a write cycle, address and data for the write
are stored in registers. The write information must be stored
because the SRAM cannot perform the last word write to the
array, without conflicting with the read. The data stays in this
register until the next write cycle occurs. On the first write cycle
after the read(s), the stored data from the earlier write is written
into the SRAM array. This is called a posted write.
If a read is performed on the same address on which a write is
performed in the previous cycle, the SRAM reads out the most
current data. The SRAM does this by bypassing the memory
array and reading the data from the registers.
Depth Expansion
Depth expansion requires replicating the LD control signal for
each bank. All other control signals can be common between
banks as appropriate.
Programmable Impedance
An external resistor, RQ, must be connected between the ZQ pin
on the SRAM and VSS to enable the SRAM to adjust its output
driver impedance. The value of RQ must be 5 × the value of the
intended line impedance driven by the SRAM. The allowable
range of RQ to guarantee impedance matching with a tolerance
of ±15 percent is between 175
 and 350 , with VDDQ =1.5 V.
The output impedance is adjusted every 1024 cycles upon power
up to account for drifts in supply voltage and temperature.
Echo Clocks
Echo clocks are provided on the DDR II to simplify data capture
on high-speed systems. Two echo clocks are generated by the
DDR II. CQ is referenced with respect to C and CQ is referenced
with respect to C. These are free-running clocks and are
synchronized to the output clock of the DDR II. In single clock
mode, CQ is generated with respect to K and CQ is generated
with respect to K. The timing for the echo clocks is shown in the
Switching Characteristics on page 24.
PLL
These chips use a PLL that is designed to function between
120 MHz and the specified maximum clock frequency. During
power up, when the DOFF is tied high, the PLL is locked after
20
s of stable clock. The PLL can also be reset by slowing or
stopping the input clock K and K for a minimum of 30 ns.
However, it is not necessary to reset the PLL to lock to the
desired frequency. The PLL automatically locks 20
s after a
stable clock is presented. The PLL may be disabled by applying
ground to the DOFF pin. When the PLL is turned off, the device
behaves in DDR I mode (with one cycle latency and a longer
access time).


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